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JPS5473533A - Extending system for system program - Google Patents

Extending system for system program

Info

Publication number
JPS5473533A
JPS5473533A JP14084877A JP14084877A JPS5473533A JP S5473533 A JPS5473533 A JP S5473533A JP 14084877 A JP14084877 A JP 14084877A JP 14084877 A JP14084877 A JP 14084877A JP S5473533 A JPS5473533 A JP S5473533A
Authority
JP
Japan
Prior art keywords
rom
system program
program
memorize
cpu
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP14084877A
Other languages
Japanese (ja)
Other versions
JPS5848932B2 (en
Inventor
Harumi Nakano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Casio Computer Co Ltd
Original Assignee
Casio Computer Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority to JP14084877A priority Critical patent/JPS5848932B2/en
Publication of JPS5473533A publication Critical patent/JPS5473533A/en
Publication of JPS5848932B2 publication Critical patent/JPS5848932B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To ensure an easy and assured extension for many different system programs within a limited address and then to have an automatic search for the extended program at the power supply throw-in time for registering.
CONSTITUTION: Main memory unit 2 to memorize the standard system program is included in the system along with n-units of ROM3 to memorize the system program to be additionally extended. When power switch 5 is thrown in, CPU1 switch decides that ROM3 is added via means 7, reads out the head address of each ROM added and searches whether the ROM given with the head address is installed actually or not. When CPU1 designates ROM3 which memorizes the wanted system program, the designation information is decoded by I/O port 4. And the desired additional ROM is selected via chip enable signal line 11 to use the system program.
COPYRIGHT: (C)1979,JPO&Japio
JP14084877A 1977-11-24 1977-11-24 Memory expansion method Expired JPS5848932B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14084877A JPS5848932B2 (en) 1977-11-24 1977-11-24 Memory expansion method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14084877A JPS5848932B2 (en) 1977-11-24 1977-11-24 Memory expansion method

Publications (2)

Publication Number Publication Date
JPS5473533A true JPS5473533A (en) 1979-06-12
JPS5848932B2 JPS5848932B2 (en) 1983-11-01

Family

ID=15278125

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14084877A Expired JPS5848932B2 (en) 1977-11-24 1977-11-24 Memory expansion method

Country Status (1)

Country Link
JP (1) JPS5848932B2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5839345A (en) * 1981-08-31 1983-03-08 Fujitsu Ltd Function selection system
JPS59136860A (en) * 1983-01-27 1984-08-06 Matsushita Electric Ind Co Ltd Disk controller
JPS6242233A (en) * 1985-08-20 1987-02-24 Yaskawa Electric Mfg Co Ltd Module formation system
JPS62224844A (en) * 1986-03-26 1987-10-02 Toyota Motor Corp Information processor
JPS63223934A (en) * 1987-03-13 1988-09-19 Hioki Denki Kk Storage device for micro-processor
JPS64102U (en) * 1987-06-16 1989-01-05
JPH0230A (en) * 1988-12-16 1990-01-05 Minolta Camera Co Ltd Interchangeable lens with data transmitting function

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5839345A (en) * 1981-08-31 1983-03-08 Fujitsu Ltd Function selection system
JPS6218056B2 (en) * 1981-08-31 1987-04-21 Fujitsu Ltd
JPS59136860A (en) * 1983-01-27 1984-08-06 Matsushita Electric Ind Co Ltd Disk controller
JPS6242233A (en) * 1985-08-20 1987-02-24 Yaskawa Electric Mfg Co Ltd Module formation system
JPS62224844A (en) * 1986-03-26 1987-10-02 Toyota Motor Corp Information processor
JPS63223934A (en) * 1987-03-13 1988-09-19 Hioki Denki Kk Storage device for micro-processor
JPS64102U (en) * 1987-06-16 1989-01-05
JPH0230A (en) * 1988-12-16 1990-01-05 Minolta Camera Co Ltd Interchangeable lens with data transmitting function

Also Published As

Publication number Publication date
JPS5848932B2 (en) 1983-11-01

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